<template>
  <div>
    <div class="shopcart">
      <div class="content">
        <div class="content-left" @click="toggleShowList">
          <div class="logo-wrapper">
            <div class="logo" :class="totalNum>0 ? 'highlight' : '' ">
              <i class="iconfont icon-shopping_cart" :class="totalNum>0 ? 'highlight' : '' "></i>
            </div>
            <div class="num" v-if="totalNum>0">{{totalNum}}</div>
          </div>
          <div class="price" :class="totalNum>0 ? 'highlight' : '' ">￥{{totalPrice}}</div>
          <div class="desc">另需配送费￥{{info.deliveryPrice}}元</div>
        </div>
        <div class="content-right">
          <div
            class="pay"
            :class="info.minPrice > totalPrice ? 'not-enough' : 'enough'"
          >{{contentText}}</div>
        </div>
      </div>
      <transition name="move">
        <div class="shopcart-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="clearCart">清空</span>
          </div>
          <div class="list-content" ref="listScroll">
            <ul>
              <li class="food" v-for="item in cartFood" :key="item.icon">
                <span class="name">{{item.name}}</span>
                <div class="price">
                  <span>￥{{item.price}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cart-control :food="item" />
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
    </div>
    <transition name="fade">
      <div class="list-mask" v-show="listShow" @click="isShow = false"></div>
    </transition>
  </div>
</template>

<script>
import BScroll from "better-scroll";
import { mapState, mapGetters } from "vuex";
import { MessageBox } from 'mint-ui';
import store from '../../../store'
export default {
  data() {
    return {
      isShow: false
    };
  },
  computed: {
    ...mapState({
      info: state => state.shop.shop_merchants,
      cartFood: state => state.shop.cartFood
    }),
    ...mapGetters(["totalPrice", "totalNum"]),

    // 结算文本
    contentText() {
      const { minPrice } = this.info;
      const { totalPrice } = this;
      let text;
      if (totalPrice === 0) {
        text = `￥${minPrice}元起送`;
      } else if (minPrice > totalPrice) {
        text = `还差￥${minPrice - totalPrice}元起送`;
      } else {
        text = "去结算";
      }
      return text;
    },

    // 是否展示商品列表
    listShow() {
      if (this.totalNum === 0) {
        // 数量减为0时，将状态置为false
        this.isShow = false;
        return false;
      }

       this.$nextTick(() => {
         // 单例对象
          if(!this.scroll){ // 可能此时不需要形成滑动
            this.scroll = new BScroll(this.$refs.listScroll, {
              click: true
            })
          }else{
            this.scroll.refresh() // 重新计算是否需要滑动
          }
        })
      return this.isShow;
    }
  },
  /* watch: {
    cartFood() {
      this.$nextTick(() => {
        this._initScroll();
      });
    }
  },
  mounted() {
    this._initScroll();
  }, */
  methods: {
    toggleShowList() {
      if (this.totalNum > 0) {
        this.isShow = !this.isShow;
      }
    },

   /*  _initScroll() {
      if (!this.scroll) {
        // 可能此时不需要形成滑动
        this.scroll = new BScroll(this.$refs.listScroll, {
          click: true
        });
      } else {
        this.scroll.refresh(); // 重新计算是否需要滑动
      }
    } */

    // 清空购物车
    clearCart(){
      MessageBox.confirm('确定要清空购物车吗?').then(action => {
        this.$store.dispatch('clearCart')
      }, () => {});
    }
  }
};
</script>
<style lang='less' scoped>
.shopcart {
  position: fixed;
  left: 0;
  bottom: 0;
  z-index: 50;
  width: 100%;
  height: 48px;
  .content {
    display: flex;
    background: #141d27;
    font-size: 0;
    color: rgba(255, 255, 255, 0.4);
    .content-left {
      flex: 1;
      .logo-wrapper {
        display: inline-block;
        vertical-align: top;
        position: relative;
        top: -10px;
        margin: 0 12px;
        padding: 6px;
        width: 56px;
        height: 56px;
        box-sizing: border-box;
        border-radius: 50%;
        background: #141d27;
        .logo {
          width: 100%;
          height: 100%;
          border-radius: 50%;
          text-align: center;
          background: #2b343c;
          &.highlight {
            background: #02a774;
          }
          .icon-shopping_cart {
            line-height: 44px;
            font-size: 24px;
            color: #80858a;
            &.highlight {
              color: #fff;
            }
          }
        }
        .num {
          position: absolute;
          top: 0;
          right: 0;
          width: 24px;
          height: 16px;
          line-height: 16px;
          text-align: center;
          border-radius: 16px;
          font-size: 9px;
          font-weight: 700;
          color: #ffffff;
          background: rgb(240, 20, 20);
          box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.4);
        }
      }
      .price {
        display: inline-block;
        vertical-align: top;
        margin-top: 12px;
        line-height: 24px;
        padding-right: 12px;
        box-sizing: border-box;
        border-right: 1px solid rgba(255, 255, 255, 0.1);
        font-size: 16px;
        font-weight: 700;
        &.highlight {
          color: #fff;
        }
      }
      .desc {
        display: inline-block;
        vertical-align: top;
        margin: 12px 0 0 12px;
        line-height: 24px;
        font-size: 10px;
      }
    }
    .content-right {
      flex: 0 0 105px;
      width: 105px;
      .pay {
        height: 48px;
        line-height: 48px;
        text-align: center;
        font-size: 12px;
        font-weight: 700;
        &.not-enough {
          background: #2b333b;
        }
        &.enough {
          background: #00b43c;
          color: #fff;
        }
      }
    }
  }
  .shopcart-list {
    position: absolute;
    left: 0;
    top: 0;
    z-index: -1;
    width: 100%;
    transform: translateY(-100%);
    &.move-enter-active,
    &.move-leave-active {
      transition: all 0.5s;
    }
    &.move-enter,
    &.move-leave-to {
      opacity: 0;
      transform: translateY(0);
    }
    .list-header {
      height: 40px;
      line-height: 40px;
      padding: 0 18px;
      background: #ddd;
      .title {
        float: left;
        font-size: 14px;
        color: rgb(7, 17, 27);
      }
      .empty {
        float: right;
        font-size: 12px;
        color: rgb(0, 160, 220);
      }
    }
    .list-content {
      padding: 0 18px;
      max-height: 217px;
      overflow: hidden;
      background: #fff;
      .food {
        position: relative;
        padding: 12px 0;
        box-sizing: border-box;
        .name {
          line-height: 24px;
          font-size: 14px;
          color: rgb(7, 17, 27);
        }
        .price {
          position: absolute;
          right: 90px;
          bottom: 12px;
          line-height: 24px;
          font-size: 14px;
          font-weight: 700;
          color: rgb(240, 20, 20);
        }
        .cartcontrol-wrapper {
          position: absolute;
          right: 0;
          bottom: 6px;
        }
      }
    }
  }
}

.list-mask {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 40;
  backdrop-filter: blur(10px);
  opacity: 1;
  background: rgba(7, 17, 27, 0.6);
  &.fade-enter-active,
  &.fade-leave-active {
    transition: all 0.5s;
  }
  &.fade-enter,
  &.fade-leave-to {
    opacity: 0;
  }
}
</style>